British Cycling has been notified of a possible anti-doping rule violation by one of its riders, the organisation has confirmed.
An unnamed cyclist failed an in-competition drugs test, with the UCI set to investigate further.
"British Cycling can confirm that it has been notified by the UCI of a potential anti-doping rule violation against a British rider based on an analysis of a sample provided in competition," a widely reported quote from a British Cycling spokesman said.
"As with any other doping violation charge at this level, those proceedings will be managed independently of British Cycling by the UCI.
"It would be inappropriate to comment further until the process has been completed."
The news comes at the end of a week in which Shane Sutton stood down from his role as technical director amid allegations of discriminatory behaviour towards female and disabled members of the team.